hi im 20, me and my partner had unprotected sex on the 6th of oct and he's sure he dint ejaculate in me. v again had sex on the 25th of oct and i got my periods the next day. but it was heavy the first day and became light 2nd day... its bright red in colour. am i pregnant. im not ready to be pregnant. . how can i avoid it without consulting a doctor. please help. very worried about it... reply asap. pls